Underground greenery

Exploration Stage: Harvest Festival
From: Adeline Svensson
Description: I also saw a card scammer come out of the dungeon. Very suspicious! Then he went to the harvest festival with a jar of something green. He didn't have it when he left, so that means he's hiding it somewhere. Let's find out what it is!
Completed: This investigation would not be possible without your help! The jar of herbs you found was in the possession of the card scammer. The grocer said it was rosemary, but it's not regular rosemary. This is a variety that only grows in the shade. I'm sure he got it from the dungeon. The card cheater must have needed it to make some kind of potion.